CVE-2022-38333 — Openwrt before v21

Openwrt before v21.02.3 and Openwrt v22.03.0-rc6 were discovered to contain two skip loops in the function header_value(). This vulnerability allows attackers to access sensitive information via a crafted HTTP request.

01What is this vulnerability?

Openwrt before v21.02.3 and Openwrt v22.03.0-rc6 were discovered to contain two skip loops in the function header_value(). This vulnerability allows attackers to access sensitive information via a crafted HTTP request.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2022-09-19T16:13:20.000Z
• Last modified: 2024-08-03T10:54:03.427Z

09References

• git.openwrt.org — https://git.openwrt.org/?p=project/cgi-io.git%3Ba=commit%3Bh=901b0f0463c9d16a8cf…
• git.openwrt.org — https://git.openwrt.org/?p=project/cgi-io.git%3Ba=commitdiff%3Bh=901b0f0463c9d16…
• git.openwrt.org — https://git.openwrt.org/?p=project/cgi-io.git%3Ba=patch%3Bh=901b0f0463c9d16a8cf5…